Henry I think you will find you have made a good buy.
The only advantage I can see with DV is tape length.
If you can't pause what your are taping for a minute to change disc go for DV.
If you want to spend all night rendering your footage go for DV.
If as you say you recorded it straight to DVD-R to don't even have to transfer it via USB you just stick it in your dvd drive and transfer it like any other file and edit away.
You can't tape over footage buy mistake, you don't have big blank spots between clips( I have had two sony video8 camcorders and it does happen no matter how careful you are).
The thumbnails are a huge advantage when searching footage.
Yes it is hard getting blank media local,I now buy online and found blankshop.com one of the best(the guy is very helpful if you speak to him).
You will find most people with DV cams will bung the footage on VHS because the don't what to do with it as your granny or aunty only has VHS.
Tape format wars in the early 80's(I had a betamax)
quality wise
No1 Philips Video 2000 system(my uncle had one),no noise bars on rewind,flip over tapes.(for younger members when rewinding to view on VHS the noise bars covered most of the screen)
No2 Betamax(sony)
No3 VHS(jvc)Utter crap at the time but won the format wars.
Format wise for CAM'S I don't think makes any difference as you keep the original copy and transfer for other people.
So for Joe public is come down to ease of use.
Old Tape or
instant access DVD.
I have had old tape for years and you can stick it.
It sticks it jams it wears and it snaps(and you have to rewind it)
DVDCAM